android微信分享圖片踩坑之旅

• 分享圖片代碼如下

• bitmap.recycle() 資源被回收了，所以每次分享的bitmap必須是重新創建出來的

    /**
     * 微信圖片分享
     *
     * @param shareType {@link SendMessageToWX.Req#WXSceneSession} 分享給微信好友
     *                  {@link SendMessageToWX.Req#WXSceneTimeline} 分享給朋友圈
     *                  {@link SendMessageToWX.Req#WXSceneFavorite} 收藏
     */
    public static void shareToWXImage(int shareType, @NonNull Bitmap bitmap, @NonNull OnShareListener listener) {
        if (checkWeChatShareInit(listener)) {
            WXMediaMessage msg = new WXMediaMessage();
            msg.mediaObject = new WXImageObject(bitmap);
  
            Bitmap thumbBmp = Bitmap.createScaledBitmap(bitmap, SHARE_THUMBNAIL_SIZE, SHARE_THUMBNAIL_SIZE, true);
            bitmap.recycle();
            msg.thumbData = Util.bmpToByteArray(thumbBmp, true);  // 設置縮略圖
  
            SendMessageToWX.Req req = new SendMessageToWX.Req();
            req.transaction = buildTransaction("img");
            req.message = msg;
            req.scene = shareType;
            mWXApi.sendReq(req);
        }
    }
  

• 分享的圖片黑屏

• 原因是圖片透明部分不做處理就是黑色的，那塊區域沒有顏色

• 方法是透明轉白色

    /**
     * bitmap中的透明色用白色替換
     *
     * @param bitmap
     * @return
     */
    public static Bitmap changeColor(Bitmap bitmap) {
        if (bitmap == null) {
            return null;
        }
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        int[] colorArray = new int[w * h];
        int n = 0;
        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                int color = getMixtureWhite(bitmap.getPixel(j, i));
                colorArray[n++] = color;
            }
        }
        return Bitmap.createBitmap(colorArray, w, h, Bitmap.Config.ARGB_8888);
    }
  
    /**
     * 獲取和白色混合顏色
     *
     * @return
     */
    private static int getMixtureWhite(int color) {
        int alpha = Color.alpha(color);
        int red = Color.red(color);
        int green = Color.green(color);
        int blue = Color.blue(color);
        return Color.rgb(getSingleMixtureWhite(red, alpha), getSingleMixtureWhite
  
                        (green, alpha),
                getSingleMixtureWhite(blue, alpha));
    }
  
    /**
     * 獲取單色的混合值
     *
     * @param color
     * @param alpha
     * @return
     */
    private static int getSingleMixtureWhite(int color, int alpha) {
        int newColor = color * alpha / 255 + 255 - alpha;
        return newColor > 255 ? 255 : newColor;
    }